Chuck



n. L. BISSET.

k CHUCK.

. APPLICATION FILED NOV- 22, 1920- 1,426,541.. P t n A g- 2. 1922 5 SHEETS-SHEET BY ATTORNZ' 0'. L. B'ISSET.

CHUCK. 1 APPLICATION FILED NOV. 22.1920. 1 ,42 6, 54 l Patent d Aug. 22, 1922?.

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CHUCK.

APPUCATION FILED NOV. 22, 1920.

Patented Au 22, 1922.

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CHUCK. APPLICATION FILED NOV- 22, 1920- I 1,426,541 Patented Aug. 22, 1922.

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CHUCK. I APPLICATION FILED NOV-22,1920.

Patentd Aug. 22, 1922?.

6 SHEETSSHEET,5.

D. L. BISSET.

-- CHUCK.

APPLICATION FILED NOV. 22. 1920.

Patented Aug. 22,- 1922i.

DAVIDFLOGAN iarssnr, or MGNTREAL, QUEBEC, cnlvnnanssmnoa To 'y t SONS CONSTRUCTION COMPANY, LIMITED, 'OF MONTREAL, QUEBEC, CANADAL To all whom it may concern:

Be'it known that I, DAVID LOGAN B ssn'r, and residing at 7 5 Columbia Avenue, in the city, and district of Montreal, in theProvince of Quebec, in the Dominion of Canada, have invented a new and usefulflhuchof which the following is the specification. The invention relates to chucks as described in the present specification and illus trated in the accompanying drawings form part of the same. The invention consists essentially of the novel means employed for insuringthe application of the wedge members by means of a reciprocating member in closing the aws to the work. v

The objects of the invention are tofacilitate the operation of pneumatic chucks; to

eliminate the detrimental effects of vibrationon the machine; to insure a firmand true grip of the'work; to furnish to factories and machine shops a chuck that will save time and labor and 1 at thesame'time materially increase efliciency in regard to the production; and generally to provide'a durable and serviceablechuck.

In thedrawings, Figure 1 is a rear of chuck showing the face plate broken and a section on the line AA in Figure 2.

Figure 2 is a vertical sectional viewof the chuck on the line B-B in Figure 1.

Figure 3 is a rear viewhaving the face plate and piston removed and showing a modification of the wedge lever construction in a three-jaw chuck.

Figure lis a vertical sectlon'al view of the-form of the invention illustrated in. Figure 3. I

Figure 5 is a rear View with the face a plate and piston removed and showlng the modification of the wedge lever applied to a two-j aw chuck.

Figure 6 is a fragmentary sectional. view of the body and piston, showing an enlarged detail of the wedge pin. I

Figure 7 is a vertical sectional view showing the casing broken away and disclosing a modification of the air inlet and expansion chamber.

Figure 8 is an end elevation of a two-jaw chuck of a special type..

' Figure 9 is a rear vlew'with face plate and piston removed, showing a modification of the application of the means. for holding the wedges to their place.

; Specification of Letters Patent.

that

I 'lPateritedkAug. 22, 1592 Application filed. November 22, 1920'. ,Seri a1-No.42 5,891. v

a 1 -Figu re10 i s a vertical section off the form. i

of the nventionillustrated in Figure 9. v i

Figure 11. is a vertical sectional view show ing. novel featuresfor... applying this type of chuck togspeoial work. e I '2 Figure12-is an end elevation of the chuck recessed to receive the cylinder in which the piston 2 operates and drives the wedgepins 3 on to the wedge levers 4E, The-wedge levers 4=-are pivoted .in recesses in the sliding aws 5 and are in the form of rocker arms, one end 6: extendinginto the bodyslots 7 from the walls of which said'levers are 'ful-'f cruined and the other 'end 8, having flattened faces 9 engaged by the wedge'pins 3; T P 1810. r cr w -thre ed int the backof the ends 8, and thespira'lsprings 1'1 encircle said pins and, e ert' -pressure on said illustrated inFigure 11 and showing; the

Like numerals of eierenee l indicateglike showing the dif- 5 ends 8 from the central boss '12. oflthe body 1: in anobliquedirection inrespeet to udit! metrical line throughthe chuck body.

pressurebrings the facesfl in proxnnlty to uthe p ns 3, in fact, into constant cl ose engagement, notmjattier what thei-posi tion ofthe pins may be ,therefore, on thejop; erationof ,the piston, the efi'ectyonthe wedges is immediat jwhich;much.{facili 1 all slackness in the jaws.

ath presres ae thskw rk a d li s In Figures 3,4, 5, and 6a'nother form of wedge lever is' shownandvin which the lever 13is'pivoted centrally in each .of thejaws '14, 15, and 16, orlZand'lS, as the case may" be. The recesses 19 in said jaws-are formed. 'with theouter wall 20 and inner wall, 21 a shaped to receive the rocking bodies 220i" the levers 18 from which the flattened ends I i v 23 extendtobe engaged the wedge pins 24 in pairs,flone pair foreach jaw, said pins 2% being operated from the piston 25. l

The lever ends 23 .are held in' -constant engagement with the pins'24t1by the spiral springs 26 encircling the pins 27 screw- 29 in Figures 5 and 6. The piston in this form is preferably 165, threaded'intothe-backs of theends 23, said springs exerting pressure from the-solid lugs 28 in Figures 3 and 4 and solid lugs 1 driven by air as in the first form described and the wedgepinsimmediately begin their v wedgingoperations .to bring the jaws to their work.

It may be mentioned that the detail in Figure 6 is generally applicable in this in vention no matter .what form it may take, though numeralled to fit in with Figures 3 and 1.

By further reference to thisfigure it will be seen-that the-pins '24: are of course in wedge shape and have the inclined 'fiatisurs face-3O extending from the circular-flanged end 31. The flanged ends 31 aresheld :to the piston by the keeper rings 32 screwthreaded into the face-ofthe piston 25.

In Figures '1 to 5 the inlet to the expan sion chamber is shown through the lathe spindle 33,but in Figure? the inlet 84 is shown in the chuck casing -35, andithis inlet registers with the annular passage :or manifold 86, which is connected ,by ,the passagesfi? to'the annular expansion groove 38. The'packing rings 39 and '40- keep the leathers 41 and 12 in place-and'the keeper ring 43 is screw-threaded on 'to the chuck adapter 44 and closes in-the rings 39 and 40 andbears on-the casing 35.

- The pins45 and springs 46 at intervals circumferentiall-y keep the rings "'39 and 1O apart'andthe leathers 41 and 42 tightlyto their place.

InFigure 8 a two-j aw chuck is illustrated, the particular feature beingqthe an-gularly recessed gripping jaws 4:7. This form is preferably operated bythe wedge lever constr-uction described in referring to 1F ig ures 3, 4;, and 5.' V

in Figures-9and 1O theresilientmemhere here shown as spiral springs-4L8 are shown as exertingpressure onthe .ja'ws 49 against the body' walls 50. The springs 48 encircle the pins 51 which are screw-thread ed into the lugs 52. These lugs52'have pin extensions 53,'that arescrewr-threaded driven by the piston 55.

The pins. 54: are guided by the bushings v56 inserted in wedge-pin-oriiices in the body and close in the jaws against said bushings.

In Figures 11 and 12 the chief feature is the central aligningplug 5'7 screw-threaded into the body opposite the inside sec tions of the jaws and centrally in relation to the inner cup 58SCTGW-tl1182td6d into-the piston 59 and projecting forwardly to-the pierced body boss 60 receiving said aligning plug 57 and guided by the inner wall. of said boss.

The jaws 61 are here shown as formed to receive the work 62 and in thisclassof worka pilot bar 68 extends through the aligning plug from the cutter bar to the cup 58. I v v It will be thus seen that the several jfeaturesherein described all tend towards ethciency inproduction andeconon y in time and labor, and this inparticularly emphac sized in the several applications of the resilient means of keeping the wedging membersrto their work.

Some, changes maybe made. from time to'time in the construction without departing from the spirit of. the invention,. but the essential elements are set forth in,the claim for novelty following:

What I claim iszf h I. l Ina chuck, aqboidy, arreciprocating member in said body; wedge" pins extending for wardly and having-flanged inner ends recesse'd in the face of said reciprocating member, a keeper ring screw-threaded into said recesses and holding said pins and sliding jaws operatively connected with said pins. Signed at Montreal, QuebecyCanada, this second day ofNovei'n'ber, 1920.

DAVID: LOGANj BISSET. 

